2021-04-02

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”

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Related research results have solved the problems in the preparation process of traditional perovskite photovoltaic materials A worldwide problem, a major breakthrough in the field of photovoltaics has been achieved.

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”

Nanjing University of Technology graduate student Hui Wei, Northwest Chao Lingfeng, a PhD student at the University of Technology, and Aloe, a master student at Nanjing University of Technology, are the co-first authors of this article.

Put the “shepherd dog” into the “sheep” to solve the pain points in the preparation of perovskite photovoltaic materials

“Basic scientific research is to do things that others have not done before, to produce Leading results, let the world follow us.” Academician Huang Wei often said to the team: “Original innovation is a breakthrough from ‘0 to 1’, which often means long and difficult exploration, but it may be disruptive. The revolutions in China have brought disruptive technologies and products.”

The major progress in preparing perovskite photovoltaic materials through ionic liquids is such a breakthrough from 0 to 1.

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”(1)

Ionic liquid and its prepared perovskite Solar cell

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”(2)

The foldable flexible electronics developed by the team Products

The development of low-carbon energy is related to the future of mankind. In today’s world, resolving the contradiction between the ever-increasing energy demand and sustainable development is the common goal of all countries. “Carbon neutrality and carbon peak” has become the main target of my country’s “14th Five-Year Plan” pollution prevention and control battle.

At present, the global renewable energy industry chain represented by “photovoltaics” is entering the fast lane of development. Among them, perovskite photovoltaics are indispensable. Compared with the silicon crystals used in traditional solar panels, it is not only cheaper, lighter, thinner, and variable, but also cheaper and more environmentally friendly. It will be disruptive in the scope of application. change. Therefore, the research of perovskite photovoltaic materials has become a “hot spot” pursued by scientists from all over the world.

“In the future, traditional batteries will no longer be needed in the desert hinterland, building exterior walls, mobile phones, etc., only a cheaper, cleaner, paper-thin perovskite solar cell will be able to meet the needs. At the same time, it can also be used in important fields such as flexible wearables and spacecraft loading.” The team’s “big brother” Chao Lingfeng is full of confidence in the application prospects of perovskite photovoltaic materials.

However, there are always many “pain points” in the research of perovskite photovoltaic materials. For example, perovskite photovoltaic materials represented by formamidine-based perovskite are very “sensitive” and are prone to phase transition in the air, which greatly restricts their mass production.

The team of Academician Huang Wei is committed to the research of perovskite photovoltaic materials, through original innovation to solve the problems of unstable materials, low photoelectric conversion rate, complex process preparation and high pollution. After years of exploration, the team focused on the preparation process of perovskite photovoltaic materials.

To solve the problem of the preparation process, we must first find an environment-friendly, stable and compatible solvent with physical and chemical properties. Ionic liquid solvents are such a kind of existence.

“From the very beginning, we jumped out of the traditional idea of ​​preparing perovskite photovoltaic materials.” said Professor Chen Yonghua from Nanjing University of Technology. After the ionic liquid solvent is introduced into the preparation process, the preparation process of the perovskite photovoltaic material becomes very simple, and the whole process can be carried out in room temperature, air and high humidity environment. What is more surprising is that through this The stability and photoelectric conversion rate of the perovskite materials prepared by the process have been greatly increased, “it can be described as killing three birds with one stone.”

“Ionic liquid is like a’shepherd dog’ on the grassland. It plays a role in issuing orders and arranging troops in the molecular composition of the’flock’, which is the perovskite. It stabilizes the formation. Then he quit silently. This new formation is the stability of the perovskite battery we want.” The team “big brother” Chao Lingfeng vividly explained.

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”(3)

FAPbI3 material prepared by ionic liquid, its The internal structure becomes neat and regular (right), greatly improving the stability of the material and the photoelectric conversion efficiency.

This research result has realized the function-oriented, preferential design, green non-toxic, stable and efficient ionic liquid perovskite photovoltaic preparation technology. It has created preconditions for the large-scale production and utilization of perovskite solar cells, and created a new era of solar photovoltaic materials.

Insist on primitive innovation and blaze new paths in the mysterious scientific jungle

In recent years, although there are more and more international teams engaged in the research of perovskite batteries, the team of Academician Huang Wei has Always in an international leading position, continuous innovation results.

Adhere to the original innovation, sit on the bench. When researchers in related fields around the world are still focusing their energy on the second-generation solar cells, the team of Academician Huang Wei began the research on the third-generation solar cells.

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”(4)

Scientists prepare perovskite in the laboratory Photovoltaic materials

Looking at the world, from the discovery that ionic liquids can be used as perovskite additives, to uncovering the mystery of ionic liquids, to building ion rapid reaction channels, only the team of Academician Huang Wei has been deeply involved in this field for many years. Under tremendous pressure and difficulties, the team cleared the way for overtaking and achieved a breakthrough from 0 to 1.

“It’s difficult! It feels like blazing a path in a mysterious jungle. I don’t know how to go or where to go.” Chao Lingfeng said.

In the process of solving this worldwide problem, in 2015, the team had preliminary ideas. Afterwards, everyone violently collided with thoughts, but no one knew how to do it. Chao Lingfeng started from scratch, groping and experimenting little by little, “I kept trying and making mistakes, and when I couldn’t keep going, I also thought about giving up on the subject.” At the critical moment, the guidance of the two teachers and the collaboration of the team members gave him perseverance. Courage.

“When we do scientific research, we must do what others have not done before and what others think is impossible to achieve. This kind of topic is meaningful.” With the encouragement of the teacher, three students, Chao Lingfeng, Hui Wei, and Aloe The determination to conquer the peak was rekindled.

“In 2017, we took a different approach and discovered a green proton-type ionic liquid to replace traditional organic solvents, that is, we found the’shepherd dog’ that makes the’flock’ line up.” Chao Lingfeng believes , This is by no means a moment of luck, but the result of the team’s day-to-day persistence and continuous innovation. In order to test how ionic liquids affect the internal mechanism of perovskite crystal structure transformation, he and his younger brothers often went to Beijing Institute of High Energy Physics and Shanghai Synchrotron Radiation Light Source to do experiments all night long. Let our subsequent research go further and more stable.”

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”(5)

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”(5)

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In 2019, the team successfully prepared a relatively stable perovskite film in the air. Subsequently, they obtained a stable formamidino perovskite structure under high humidity conditions, which was published in the top international journal Chem The research results were released on this page, which injects a booster for everyone.

After a year, the team built a highly efficient and stable layered perovskite solar cell, with a new high photoelectric conversion efficiency. Soon, they prepared an all-inorganic perovskite in humid air. Solar cells broke the academic circles’ traditional concept that “all inorganic perovskites are unstable under high humidity in the air”.

In 2021, this research result will be more mature, and it will be one step closer to large-scale production and application.

Although the path of scientific research is full of unknowns and challenges, it also bestows the joy of exploration and the joy of success to persevering and diligent scientists.

“In this team, everyone likes to be the first and encourage trial and error. The teacher provides us with a broad space and strong support.” Hui Wei said, “despite the scientific research process It’s hard work, but being able to do something meaningful with everyone is priceless.”

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”(6)

Be mindful of the motherland, serve the people, and firmly follow the road of independent innovation with Chinese characteristics

The road to original innovation has never been smooth.

What force has injected a steady stream of momentum into the team?

“Scientific research workers must have the motherland in mind, and scientific research must serve the people.” This is the “first lesson” for every teacher and student who joins the team of Academician Huang Wei.

The innovative research results of the team of academician Huang Wei of Northwestern Polytechnical University are listed in “Science”(7)

Academician Huang Wei believes that the “No man’s land” tests the ability of scientific researchers, and also reflects the original intention and feelings of science to serve the country. “What we are doing is to unswervingly follow the path of independent innovation with Chinese characteristics. First, we must plan ahead, pioneer a new path, and open up a field; second, we must hold the’null nose’, think more about accidental phenomena, and overcome weak links; third, we must “Asymmetric” catching up and surpassing, make great efforts to catch up with the neck.”

Currently, a new round of technological revolution and industrial revolution has spawned a number of major disruptive technologies. The industry generally believes that these new industries, New ecology and new fields are reconstructing the global innovation landscape and reshaping the global economic structure. Facing the eight frontier fields of science and technology that are most likely to nurture disruptive technological innovations, the team of Academician Huang Wei has always dared to be the first in the world and “treasure hunting” in the original and innovative “no man’s land”.

At the beginning of 2021, the Chinese Academy of Sciences and Clarivate Analytics jointly released the “Research Frontiers 2020” report, fully affirming the achievements of Northwestern Polytechnical University’s flexible electronics discipline construction, and highly appraising this team—— The team has achieved a series of leading and forward-looking research results in the field of flexible electronics. The flexible electronics research team led by Academician Huang Wei is becoming an important supporting force in the field of flexible electronics in my country to overtake and produce disruptive scientific and technological innovations.